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Fair Value and Interest Rate Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Fair Value Disclosures [Abstract] |  |
Short-term borrowings | 90 days |
Transfer of assets between level 1 , 2 or 3 | $ 0 | $ 0

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- Definition Fair value assets level one to level three transfers amount. + References No definition available. + Details
Name: | pnbk_FairValueAssetsLevelOneToLevelThreeTransfersAmount
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maturing period of borrowings under short term repurchase agreements and other short term borrowings. + References No definition available. + Details
Name: | pnbk_MaturingPeriodOfBorrowingsUnderShortTermRepurchaseAgreementsAndOtherShortTermBorrowings
Namespace Prefix: | pnbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration